![]() ![]() ![]() For example, if you have 10.15.7 build 19H2 or 19H15, you can install security update 2021-001 without needing to install the intermediate updates first. Supplemental and security updates are usually combo-like within the release they apply to. Note: in the build numbers, the first "19" corresponds to the major version (Catalina v10.15), the "H" corresponds to the minor version (".7"), and everything after that is the more specific sub-minor-version number. For instance, the original release of Catalina 10.15.7 was build 19H2, but then Apple released a supplemental update which brought it up to build 19H15, and then security update 2020-001 brought it up to build 19H114, and then security update 2021-001 was build 19H512, and then. ![]() The complication I left out is that in addition to the delta and combo minor-version updates I describe above, there are also even-more-minor OS updates, called "supplemental updates" and "security updates" that don't change the version number, just the build number. It automatically figures out what update(s) you need, so this question is a bit moot. Updates come via the Software Update mechanism, either in System Preferences or with the softwareupdate command. One major recent change is that, starting with macOS Big Sur (aka macOS 11), Apple isn't releasing OS updates in downloadable format. UPDATE: There's a complication I left out, and some other things have changed and gotten messier since I originally wrote this. (Mind you, the types of problems this solves are rare but they tend to be ones that otherwise would've involved hours of troubleshooting and hair-tearing, so it's often worth a try.) (Also, you can't/shouldn't reinstall even a combo update after applying a supplemental or security update that came out after it that'd be a downgrade, and might cause problems.) In fact, sometimes re-running the combo on an already-updated computer will fix problems like this, so it's a useful trick to have in your troubleshooting repertoire. If anything has gone wrong with any of the previous updates, running the combo will generally clean up the problem, while a delta might leave it broken. It's simplest to just carry the combo update and not worry about the deltas as well, since you can use the combo anyplace the delta would be appropriate. I update a lot of computers, so to save time I carry the latest updates on my tools HD. But some people (myself included) tend to prefer the combo, for a couple of reasons: If you have a Mac that's running the next-to-latest version and want to update it, the delta is technically all you need. 10.8.1 or 10.7.1, there's no real distinction between delta and combo, so Apple only publishes a single update form.) (Note that for the first update to a major version, e.g. Similarly, the 10.7.5 combo update can be run on anything from 10.7.0 to 10.7.5. A combo update containing all of the changes since the original release of that major version, and therefore can be used on anything from the same major version.įor example, the 10.8.2 combo update can update from either 10.8.0 or 10.8.1 it can even be reinstalled on a system that's already running 10.8.2.A delta update containing all of the files that changed in the latest update, which therefore can only upgrade from the immediately previous version.įor example, in order to install the 10.8.2 delta update, your system must already be updated to 10.8.1.10.8.1 -> 10.8.2), they generally release the update in two forms: ![]() When Apple releases a minor system version (e.g. ![]()
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